Process of treating tin-plate for canned provisions.



KENIGHI MIYAZAKI, OF TOKYO, JAPAN.

' PROCESS OF TREATING TIN-PLATE FOR CANNED PROVISIONS.

No Drawing.

To all whom it may concern:

Be it lmown that I, KENIGHI MIYA ZA KI, a subject of the Emperor of Japan, residmg at No. 3 Koyamacho, Mita, Shiba-Ku, city of Tokyo, Empire of Japan, professor, haye invented new and useful Improvements in Processes of Treating Tin-Plate for Canned Provisions, of which the following is a specification. I

This invention relates to an improved process for coating the surface of tln plate used in the manufacture of cans, etc., for canned provisions with a mixture of raw lacquer and shellac, so. as to render it proof I as for instance won from the lacquer-tree botanically known as Rims oerm'cifem, stirring gently, removing the greater part ofv the moisture, and other impurities, until desired hardness is reached, then adding thereto a certain quantity of dissolved ShGl? lac, .and after thorough mixture, passing the mass through a suitable filter, preferably through cotton. The mixture thus prepared is now fit for use. a Thesurface of an ordinary tin plate upon which my said mixture is to be applied should be perfectly cleaned. For this purpose, I repare a piece of clean rag or cloth, refera ly soaked with a diluted alkali iquid in orderto wipe off all the greasymatters adhering to, the surface ofthe tin plate, whereafter I wipe the plates with a piece of'clean cloth or rag soaked inan acid.

in order to remove or neutralize the alkali previously used, after-which ;the: late is wiped carefully with some "alcoho scaked The plate" cloth to remove the:- moisture. which is-now cleaned 'wiJlbe then heated to a temperature-of preferably from to degrees C. Atthis temperature the plate is now carefully'painted with the aforede scribedmixture of lacquer and shellac spread Specification of Letters Patent.

,SlStlng in cleaning the tin Patented Aug. 3, 1915.

Application filed July 28, 1913. Serial No(781,643.

evenly over the heated surface. The painted plate will then be brought into a metallic frame, which is adapted to carry or hold several sheets of such painted plates for the purpose of conveying them all at the same time into a closed wet chamber containing preferably from 7 5 to 95% of moisture (temperature of this room must not be lower than 10 degrees (3.), where they are allowed to remain for about 24 hours. This will make the painted material gradually dry and adhere. The frame carrying several sheets of the painted plates is now taken out of the wet chamber and passed into the closed dry chamber, where they are heated for aboutilgto 2 hours to a temperature of preferably from 120 to 180 degrees C. By this final treatment, all the volatile organic substances contained in the mixture will be evaporated, leaving a very brilliant goldish layer of coating firmly adhering to the surface of the tin plate, but bearing no offensive smell characteristic of the lacquer.

The coating adhering to the surface of the tin plate is lasting and can not be removed. Even. the bending of the plate up and down repeatedly can not remove the coating, which is of great advantage in the operation of can-making, because the punching, shearing, or flanging action of the machinery would have no effect on the part of the coating.

. Ihavc found that my coating withstands atemperature of 200 degrees (3., and, therefore, the high grade sterilization of canned goods on -120-degrees, or up, can be efiectively carried out without deteriorating th contents of the cans.

Lobster and crab for instance, if packed in an ordinary can, turn blackvery frequently, which defect is entirely obviated by my present invention.

Having now particularly described and ascertained the nature of mysa-id invention, and in what manner the same is to be performed, I declare that what I claim is:-

1. Process for producing lacquered tin plate especially for canning purposes conlate, coating the same with a lacquer read y solidifying x under constant stirring and containing a small percentage. ofshellac or varnish, treatj v ing the coated plate within a humid chamfl -b er and-finally heating and-'drgin A the same at a temperature of 12O-180P;

-- 2. Process "for, producing lacquered plate, especially'for canning purposesfcondrying the same at a temperature of 120- sisting in cleanmg the tin plates with diluted 180 alkali, neutralizing the alkali, treating the In testimony whereof I afiix my signature late with alcohol and coating the same with in presence of two witnesses.

5 acquer readily solidifying under constant KENICHI MIYAZAKI.

stirring and containing a small percenta e Witnesses: of shellac or varnish treating the plate wit GENJI KURIBARA,

in a humid chamber and finally heating and HARNTADA YASUMURA. 

